My reccomendations as a local:
Kogod Courtyard in the Smithsonian American Art/Portrait Gallery (Sir Norman Foster w/ Gustavson Guthrie Nichol) – Hopefully they will have the water scrims fixed by then
Dumbarton Oaks – Beatrix Farrand
US Capitol Grounds – F L Olmsted
FDR Memorial – Halprin
National Gallery Sculpture Garden – Olin
Thats a pretty good representation, although there is TONS more, someof it a bit out of the way. These are the major works by major players in the LA profession.